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HKS plugs that PTG offer are made for Nissan GTR. Those plugs are the correct thread and length for M177. People say they are running those with upgraded turbos.
Good question- What spark plugs are Black Series AMG GT (highest hp model) using?
So, what is the recommended plug if you want to do a 1 range colder. I've seen HKS recommendations but they claim there are no plugs for a GT.
Anyone with first hand knowledge and a reasonable deal?
Again…..it’s the HKS branded plug PTG sells, and I’m sure elsewhere utilizing the part number of plug.
This plug is in many AMG GT platform cars, so that means a running track record of its use, which is better than hunting down something else and getting it wrong.
[QUOTE=dlefty;8709454]It’s out there and known:
Your factory plug is an “8”, the HKS is a “9” so that means 1 colder….since made by the same manufacturer.[/QUOTE
The Top Electrode of the HKS is different than the OEM.
Do you think the ignition coils need to be swapped for these plugs?
It’s out there and known:
Your factory plug is an “8”, the HKS is a “9” so that means 1 colder….since made by the same manufacturer.[/QUOTE
The Top Electrode of the HKS is different than the OEM.
Do you think the ignition coils need to be swapped for these plugs?
No AMG GT car that is running the 1-range colder HKS plug has changed a coil yet for fitment reasons. I would have mentioned earlier if it was necessary.
The NGK 93253 hex size is 16mm. The M178 calls for hex size 14mm plugs. I am not sure about the fit for the M178 engine. I have been told that the NGK 97537 is the right fit. It has Hex size 14mm. However, these are racing plugs, so I am not sure about fitness for less aggressive driving or emission issues.
I got multiple thumbs up on the HKS 50003-M45HL for track and daily use. As for my personal preference, changing sparkplugs in these cars is not a walk-in-the park, so going back and forth in a multi-purpose vehicle use can be a time-consuming issue.
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